Advil And Other Over Counter Medicines

Hi: I can't seem to find any info on whether or not it's safe to take ibuprofen, acetaminophen (even children's Tylenol) or other over-the-counter drugs. Does anybody know if they are gluten-free? The ingredients on the ibuprofen label I have includes pregelatinized starch among other inactive ingredients.

I actually have a terrible headache but don't want to make things worse, so if anybody's around and can answer soon I'd be grateful. Thanks.
Ellen

I actually just called Advil yesterday to see if their cold and sinus medicine was gluten free since it had starch in the ingredients. I was informed that it is corn starch and that all of their products are gluten-free!